Dr Jon Hasleton

Dr Jonathan Hasleton is a Clinical Director and Consultant Cardiologist, and expert witness at the Royal Liverpool University Hospital and Liverpool Heart and Chest Hospital NHS Foundation Trust. His principal areas of clinical expertise include interventional cardiology, coronary artery disease, cardiovascular imaging, chronic and ischaemic heart disease, and the investigation and management of chest pain, breathlessness and palpitations.

His clinical practice is focused on the diagnosis and treatment of patients with a broad range of acute and chronic cardiovascular conditions. He has particular expertise in coronary artery disease and performs interventional procedures, including coronary angiography and coronary angioplasty, alongside the medical management of patients with hypertension, chronic heart disease and other complex cardiac disorders. He also has extensive experience in cardiovascular imaging, enabling detailed assessment and investigation of patients with suspected or established cardiac disease.

Alongside his clinical work, Dr Hasleton provides strategic leadership as Clinical Director of Cardiology, helping to oversee the delivery and development of specialist cardiology services. His combination of advanced interventional expertise, diagnostic imaging experience and leadership responsibilities reflects a comprehensive and contemporary cardiology practice, providing high-quality care across the full spectrum of general and interventional cardiology. 

Dr Jonathan Hasleton has undertaken medico-legal practice since 2025, providing independent expert opinion in Clinical Negligence and Professional Regulatory / Fitness to Practise matters. His practice focuses on preparing Screening / Advisory, Breach of Duty, Causation and Condition & Prognosis reports for claimant instructions.

His medico-legal work draws upon specialist expertise in interventional and general cardiology, with instructions commonly involving coronary artery disease, chronic and ischaemic heart disease, coronary angioplasty, cardiovascular imaging and the investigation and management of patients presenting with chest pain, breathlessness and palpitations. He provides clear, balanced and evidence-based opinions on the standard of cardiac care, diagnostic decision-making, treatment pathways, causation and prognosis, helping solicitors evaluate complex cardiovascular claims involving both medical and interventional cardiology. 

Dr Hasleton's clinical practice is centred on the assessment, investigation and treatment of patients with coronary artery disease and the full spectrum of general cardiology conditions. He regularly manages patients presenting with chest pain, breathlessness and palpitations, using advanced diagnostic investigations, including cardiac MRI and coronary angiography, to establish accurate diagnoses and guide treatment. His work encompasses both acute and chronic cardiovascular disease, with particular expertise in the management of chronic and ischaemic heart disease and hypertension.

A significant part of his practice involves interventional cardiology, performing coronary angioplasty and other catheter-based procedures for patients with coronary artery disease. He combines procedural expertise with comprehensive long-term medical management, ensuring patients receive evidence-based care throughout diagnosis, treatment and follow-up. His specialist interest in cardiovascular imaging further supports detailed evaluation of complex cardiac conditions and informs clinical decision-making across a broad range of cardiovascular disorders.

Through his day-to-day clinical work, Dr Hasleton manages patients with both routine and complex cardiac conditions, providing specialist assessment, investigation and treatment across the full patient pathway while delivering a balanced combination of diagnostic, interventional and ongoing cardiology care. 

Dr Hasleton completed an MD in Cardiovascular Medicine at University College London and has contributed to cardiovascular research as a Clinical Research Fellow at The Hatter Cardiovascular Institute. He has published in peer-reviewed journals, reflecting his ongoing commitment to advancing knowledge and supporting evidence-based practice within cardiology.